Weft inserting device for weaving looms having a continuous weft supply



Jan. 16, 1940. R DEWAS 2,187,344

WEFT INSERTING DEVICE FOR WEAVING LOOMS HAVING A CONTINUOUS WEFT SUPPLYFiled Oct. l2, 1938 V g, fr

lmvxamon /EAYMO No DE WA 5 L` ATTORNEYS Patented Jan. 16, 1940 PATENToFFlcE WEFT INSERTINGV DEVICE FOR WEAVING LOOMS HAVING A CONTINUOUS WEFTSUPPLY Raymond Bewan, ens, lift-ance Application-October 12, 193B,Serial'No. 23%,547 In France @ctolier 3d, 1937 2 Claims.

The invention relates to weaving looms having weft inserting memberswithout a cop. and has for its object a device which enables wei'ts of*`different natures, colour, or kind to be inserted.

Such devices have already been proposed for these looms which have-shuttles without a cop or have needles, and which are supplied by largestationary weft bobbins: for example those in which the members forpresenting the various weft threads are located, for the selection,either behind, or in front, or at the end of the slay, or again above orbelow the path of the weft inserting member at the instant when thelatter catches the weft.

Said devices cannot be used in practice in weaving looms which have ashuttle without a cop or have needles, operating according to theapplicants weaving process, and which are described in particular in hisUnited States Patents Nos. 2,072,159-2,053,657-2,072,IBL-42,116,620-reference being made to the fact that according to said process, inorder to enable the weft thread to be caught by the moving weftinserting member when the latter enters the shed. the weft thread whichcomes from the bobbin has -to be stretched in front of the shed from thefell point to which it is still attached, and approximately atmid-height of the shed.

Prior artdevices cannot be used in the applicants weaving process, sincethe presenting members of these devices do not occupy certain speciilcpositions, namely, they are not placed simultaneously above' the planeof the cloth. Furthermore, presenting members of .prior art` devices areusually not formed, so that they can be carried by the slay and can hookthe thread at a predetermined spot and instant when the. slay occupies apredetermined position. However, even a hook member of this type couldnot be utilized unless it catches the thread at the place and instantrequired bythe applicants process. Finally, in the applicants process,the positioning membermust cooperate with presenting members of aspeciiic type.

The device which is `the object of the invention and is moreparticularly applicable to the api plicants looms, comprises, inprinciple and as regards construction, a series of presenting membersfor the selection ol'` the threads (preferably eyelets) having thefeature of being located above the plane of the cloth at the same timeas at some distance outside the selvedge and beyond the point where theweft inserting member comes into contactwith the weft to be caught, andalso in a plane which corresponds (El. lim-MZ) approximately to that inwhich the slay passes when it is at about two thirds of its rearwardtravel, said present-ing members cooperating with a fixed or movablepositioning member (preferably a linger or hook), which is dependent ofand also, in spite of the rearward movement of l the slay, to compel thethread to pass between the reed and the weft inserting member when thelatter is formed by a needle.

In order to enable the invention to be clearly understood, and by way ofan exemplaryrealiza- 18 tion, an embodiment applied to a needle loom isdescribed hereinafter and diagrammatically illustrated in theaccompanying drawing in which:

Fig. l is a partial view in front elevation (on the breast beam side)showing one of the ends of the slay,

Fig. 2 being a view in side elevation, in section along the line 2-2 ofFig. 1.

According to these figures, l is the slay, seen from the breast beam 2,in position for beating up the weft at the fell of the cloth 3, I beingthe box or channel for the inserting needle, 5 one of the swords and 6the reed. f

Elements 'I are rocking levers, .the pivot'8 of 30 which is xed on theend of the breast beam 2, the downward and `upward movements of saidlevers, in vertical planes, being eiiected by means of cams 9andiretracting springs I0, rollers Il,

secured to the levers 1, being in contact with 1 the cams 9 which arefast on a shafy I2 provided with a wheel I3, the chain of which passesover a driving sprocket fast on the end of the crankshaft of the loom.

Said rocking levers 'I are arranged outside 4o the sword 5 and theirconstruction is such that the presenting members fdr the'weft threadstobe selected, which members are formed by eyelets in the example, whichare mounted at the endof sadlevers, are located outside the selvedge ofthe cloth 3, above the slay l and approximately at two thirds oftherearward travel -slightly diiferent lengths and oscillations, so as5i) Jto prevent the entanglement of the threads.

In order to facilitate the comprehension of the -invention, it has beenassumed that only two levers l are used having eyelets I4 and I5 whichalternately present two d iilerent wefts a and b,

for manufacturing a plain or calico weave fabric, each of said threadsrunning from the fell point c to its supply bobbin, passing through itsrespective eyelet I4 or I5.

In the example shown (Fig. 2), the eyelet I4 and its lever 'I are shownin the raised inopera- -tive position, the weft thread a not having tobe presented to the weft inserting member, whereas the eyelet I5 and itslever 1 are shown in the lowered position I5' for presenting thethreadin the position b'.

In the next operation, as the be presented, the eyelet Il will belowered to I4' in order to present said thread in the position a',whereas the other thread will have returned to the inoperative positionb, its eyelet having been raised to I5. r

In order to ensure the correctness of the presentation of the thread inthe path of the weft inserting member, a finger, hook, or otherequivalent member, I6, the point of which is turned in the direction ofthe rearward travel of the slay I, is mounted on the rear face of saidslay.

Said finger I6 may be movable, so as to enable l the positioning of thethread to be more accurately and conveniently adjusted according to thekind or the dimensions of the weft inserting member used. [t may, inthis case, have a reciprocating upward and downward movement, which,owing-to its downward movement, will furthermore enable the levers 'l tobe moved less downwards.

In the example shown, the finger i6, which is formed by a polished steelwire, is movable and its rod-shaped support il reciprocates in aslideway It flxed on the rear faceof the slay i, the end of said rodbeing actuated, for example by a grooved cam fast on the shaft whichserves as a spindle for the swords 5, in the case in which said shaftactuates the weft inserting needles by the propelling means usually usedin these looms.

The operation of this device is as follows, starting from the positionsgiven the various members in the drawing:

At the instant when the slay beats up the weft (Fig. l), the lever iwhich has an eyelet i5 and which has started moving downwards, hasbrought its eyelet from the inoperative position i5 to the position i5',thereby anguiarly displacing the thread to be presented, from theposition b to the position b', starting from the iell point c, andbringing it finally to the correct position at b", owing to the factthat said lever i' completes the downward movement of its eyelet to iii,preferably at the instant when the slay i starts its rearward movement.

Owing to the rearward movement of the slay, the point of the finger i@passes above the thread b" and said finger is moved downwards as shownat it. Owing to this fact, the thread is therefore caught and moveddownwards by the finger it into the position b.

At this instant, the portion of thread between the fell point c and thefinger at it', is inthe correct presenting position in front of theopening of the shed, and in the path through which the inserting needletravels when it is driven towards the shed.

When the thread is caught by the needle and drawn into the shed, thelever 'i moves upwards and brings the eyelet into the inoperativeposition I5, the thread which comes from said eyelet remaining caught bythe finger it. As the slay thread a has to continues its rearwardtravel, the arm of the needle and the nger I6 are brought behind theplane of the eyelet I5, but the thread is compelled to go round saidfinger, thereby obliging it to continue to pass between the reed and thearm of the needle.

After the change of the weft thread which is caught in the middle of theshed by the pulling needle from the inserting needle, theslay againmoves forwards towards the fell and owing to this forward movement, thefinger I6 loses contact with the thread which, when the weft is beatenup, will thus be directly tensioned between the fell point c and theeyelet, in the inoperative position I5.

The other lever 1 has started, slightly before the beating of the weft,to move its eyelet downwards from the inoperative position I4 and bringit successively to I4 and finally to Il, the thread a successivelymoving to a and a", then being caught by the finger I6 at the beginningof the return travel of the slay, and so forth, alternately for eachlever 'L As stated, the number of levers having an eyelet may begreater; similarly, when the weave requires it, the eyelets are actuatedby a dobby motion of the type, for example, of those used for shuttling,said motion being advantageously constructed to impart tothe eyelets anequivalent movement to that given by the cams 9.

The finger may be so'shaped that, alone or in combination with otherfingers or elements which are or are not secured to the same support il,the equivalent of the grid of a weft stop motion is formed thereby, thefork of which is located behind the slay and is supported by the usualhammer lever which is itself mounted on the frame. Of course, it isunderstood that without exceeding the spirit of the invention, changes,improvements and additions may be made, and also the use of equivalentmeans may be contemplated.

Thus, for example, the levers 'i and the cams 9 could be arrangedparallel with the slay, or again, while remaining arranged perpendicularto the slay, as shown, said levers and cams could be located on theother side, that is to say towards the rear of the slay, or again thelevers might occupy intermediate positions, but in these different casesthe position of the eyelets would remain lthe same.

As regards the finger i6, when movable, same could have other movementsthan a rectilinear reciprocating one, it being possible for suchmovements to be more or less complex, combined with each other or not,in order to enable said iinger to full its function in the most elcientmanner.

if necessary, in the case in which it is not desired to check thepresence of the weft on the pulling needle itself, said nger mayfurthermore be used as an electric weft stop motion for examplebyproviding it with a suitably insulated blade Which would be lifted bythe thread.

Finally, the number of levers 'I may be doubled so as to enable twosimilar threads to be made available, thereby enabling the spare threadto be presented automatically in the event of breakage or exhaustion ofthe other thread, without stopping the loom.

I claim:

i. A device for inserting different wefts in weaving looms which haveweft inserting members without a cop, in which the presenting membersfor the selection of the threads have the feature of being located abovethe plane o1' the cloth, at the same time as at some distance outsidethe selvedge and beyond the point where the weft inserting member comesinto contact with the weft to be caught, and also in a plane whichapproximately corresponds to that in which the slay passes toward theend of its rearward travel, said presenting members,- preferablyeyelets-co-operating with a positioning member, constituting a hookednger which is dependent on the slay and which hooks the portion of theselected thread between the point where the weft inserting member comesinto contact with the weft to be caught and the eyelet,

5 from the beginning of the rearward travelo! the slay, after beating upthe weft, and releases said thread towards the end of its forwardtravel, prior to the beating up oi' the lfollowing weft which has justbeen supplied by said thread.

2. An embodiment of a device as in claim 1, according to which thepresenting eyelets are mounted at the end of rocking levers which areactuated by cams, the positioning member constituting a hooked ngerdirected towards the rear of the loom and movably mounted on the rearface of the slay in such a manner that a reciprocating movement may beimparted to it by a. cam.

RAYMOND DEWAS.

